1021320943 has 2 divisors, whose sum is σ = 1021320944. Its totient is φ = 1021320942.

The previous prime is 1021320901. The next prime is 1021320959. The reversal of 1021320943 is 3490231201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021320943 - 2¹³ = 1021312751 is a prime.

It is a super-2 number, since 2×1021320943² = 2086192937220818498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021320973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510660471 + 510660472.

It is an arithmetic number, because the mean of its divisors is an integer number (510660472).

Almost surely, 2^1021320943 is an apocalyptic number.

1021320943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021320943 is an equidigital number, since it uses as much as digits as its factorization.

1021320943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1021320943 is about 31958.1123190967. The cubic root of 1021320943 is about 1007.0570617276.

The spelling of 1021320943 in words is "one billion, twenty-one million, three hundred twenty thousand, nine hundred forty-three".